My WebLink
|
Help
|
About
|
Sign Out
Home
Browse
Search
2013-10-06_PERMIT FILE - C1981019
DRMS
>
Day Forward
>
Permit File
>
Coal
>
C1981019
>
2013-10-06_PERMIT FILE - C1981019
Metadata
Thumbnails
Annotations
Entry Properties
Last modified
8/24/2016 5:32:08 PM
Creation date
1/11/2016 8:36:04 AM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1981019A
IBM Index Class Name
Permit File
Doc Date
10/6/2013
Doc Name
Operation and Reclamaiton Plans
Section_Exhibit Name
Volume 15 Rule 2.05
Media Type
D
Archive
Yes
There are no annotations on this page.
Document management portal powered by Laserfiche WebLink 9 © 1998-2015
Laserfiche.
All rights reserved.
/
53
PDF
Print
Pages to print
Enter page numbers and/or page ranges separated by commas. For example, 1,3,5-12.
After downloading, print the document using a PDF reader (e.g. Adobe Reader).
View images
View plain text
RULE 2 PERMITS <br />The major piece of equipment that will be powered by electricity in the Collom area is the shovel. <br />Therefore, during the life of the mine it is necessary to periodically move the existing power line loop to <br />accommodate the advancement of the pit. <br />Haul and Access Roads <br />A haul road will be constructed to facilitate mine traffic from the primary crusher to the Gossard load out <br />facility located northeast of the proposed pits. This approximate 6 mile long haul road will be constructed <br />to meet the specifications and standards set forth in Rule 4.03.1 (See Map 25E, Sheets 1 -9). The <br />proposed haul road will be constructed with a crown, and constructed upon the most stable available slope <br />to minimize erosion. Overall grade of the road will not exceed l OH: l V with a horizontal alignment <br />consistent with the existing topography. Ditches, erosion controls, and culverts will be used to minimize <br />impacts to surrounding areas, and will be designed in such a manner to safely pass peak runoff from a 10 <br />year, 24 hour precipitation event (Please see Exhibit 24, Item 1 — Collom Haul Road Culverts). <br />Additional design information for the Collom Haul Road is listed in the Construction Notes section of <br />Sheet 3 of 9, on Map 25E. This road is specifically designed to meet the applicable haul road regulations <br />as well as Rio Tinto internal road design guidelines while minimizing additional disturbed area and <br />preventing environmental damage. As shown on Map 25E, the maximum sustained road grade is about <br />5.1 %. Cross fall slopes between centerline and road shoulders shall be between 1 and 2 percent as <br />directed by the field engineer. The road shall have an overall width of 100 feet, with a 24 foot paved <br />running surface as shown on the cross - sections. The road length is about 29,000 feet. <br />Asphalt pavement specifications shall be based on a 30 year design life with a 15" thick base course <br />(gravel) and 8.5" asphalt thickness. The pavement design is based on 50 ton coal haul trucks with axle <br />loads of about 81 psi. This specification assumes an R -20 silty sand subgrade material. Base course shall <br />be CDOT Class 6 aggregate. A 6 foot high berm shall be used at all locations where the roadway is <br />elevated. Cut slopes shall be 0.5H: IV or less when completed in competent rock. Elsewhere, cut slopes <br />in unconsolidated materials shall be laid back at 2H:IV or less as directed by the field engineer. <br />Requirements for fill placement shall be as specifically described in Rule 4.03.1 Haul Roads (3) (e) `Road <br />embankments ". A ditch shall be installed at toe of all cut slopes. If needed, temporary erosion control <br />measures shall be implemented during construction to minimize sedimentation and erosion until <br />permanent control measures can be established. <br />There are two main haul roads that will be built to haul overburden materials from the pit to the <br />temporary overburden stockpile. These are shown on Map 25D and are designated as the Central and <br />East Haul Roads. The East Haul Road will also be used from the pit to haul coal to the truck dump. This <br />road configuration is needed given the valley configuration, the planned depth of the pit, and the spoilpile <br />design. These roads have been designed to meet the applicable portions of Colorado DRMS Rule 4.03.1 <br />for Haul Roads. <br />Both roads are designed with an overall width of 120 feet as shown on the cross - sections. The Central <br />Haul Road is the lowest in elevation and will eventually tie into the floor of the pit. It is about 6,200 feet <br />in length and has a maximum sustained slope of 8.3 percent. The East Haul Road is about 5,200 feet in <br />length with a maximum slope of 5.8 percent. These roads are also specifically designed to meet Rio Tinto <br />internal road design guidelines while minimizing additional disturbed area and preventing environmental <br />damage. Other design requirements are presented in the Construction Notes section of Map 25D and are <br />summarized below. Cross fall slopes between centerline and road shoulders shall be between 1 and 2 <br />percent as directed by the field engineer. <br />Collom — Rule 2, Page 97 Revision Date: 9/28/11 <br />Revision No.: PR -03 <br />
The URL can be used to link to this page
Your browser does not support the video tag.